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Pre‐ and post‐performance differences in standard deviation of the steering angle (SDSA) for left hemisphere N2 slow SpA enhancers and non‐enhancers. A decrease in left hemispheric N2 slow SpA from the control to the learning night leads to a significant overnight decrease in SDSA, whereas a slow SpA increase seems to stabilize SDSA. High SDSA values indicate low steering accuracy. Error bars represent standard error of the mean
